AD 91-18-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Fokker Services | F27 Mark 050 | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 100 | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 200 | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 300 | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 400 | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 500 | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 600 | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 700 | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
Unsafe Condition
Elevator and trim tab flutter during flight and reduced controllability of the airplane.
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Required Actions
Within 100 hours time-in-service, perform a visual inspection of the elevator trim system to detect worn, loose, cracked, or broken parts, and repair any discrepant parts before further flight. Within 18 months after October 8, 1991, modify the elevator trim system per Fokker Service Bulletin F27/27-130, which terminates the repetitive inspections. Alternative methods may be approved by the FAA.
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Compliance Time
Within 100 hours time-in-service, unless accomplished within the previous 400 hours time-in-service, and thereafter at intervals not to exceed 500 hours time-in-service for inspections. Modifications required within 18 months after the effective date (October 8, 1991).
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Affected Aircraft
Fokker Model F-27 series airplanes with serial numbers 10102 through 10684, 10686, 10687, and 10689 through 10692, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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